I thought that it is only a GG problem and that plugin is messed up, because it seems like it cannot handle proxy+SSL (SSL connection forced in this plugin update). Are you sure you have the same problem with jabber? (it could suggest sth global then)

To disable SSL in GG right now, you would have to use DbEditor plugin. After installation, launch it from "Main menu -> Database -> Database Editor++". In the opened window, find in the left panel "folder" with name as internal name of your GG account (probably "GG" with some number) and click it. In the right panel find item with name "SSLConection" double-click it and change its value from 1 to 0. Try to reconnect. It could help but in case it would not then do the same for "ManualHost".